Utilizing exhaust-steam



UTILIZING EXHAUST STEAM.

Patented- Dec. 5, 1882.

FlG.-1.

UNITED STATES PATENT OFFICE.

HARVEY T. LITOHFIELD, on HULL, AND DAVID RENSHAW, OF OOHASSET,

' I MASSACHUSETTS.

UTILIZING EXHAUST-STEAM..

SPECIFICATION forming part of Letters Patent No. 268,419, dated December 5, 1882.

Application filed August 3, 1881.

To all whom it may concern:

Beit known that we, HARVEY T. LITCHFIELD, of Hull, county of Plymouth, and DAVID REN- SHAW, of Oohasset, in the county of Norfolk, and all of the State of Massachusetts, have invented a new and useful Iinprovementin Process of Utilizing Exhaust-Steam, of which the following is a specification.

Our invention has for its object an improvement in the method of utilizing the exhauststeam of en gines, whereby the heat of the steam is returned to the boiler from whence it came, thus producing a great saving in fuel.

It consists in pumping the Water from a lowpressure boiler into a high one, then superheating the steam of the high-pressure boiler in a superheater, and carrying the superheated steam to an injector, where it meets the exhaust-steam of an engine and forces it, by its superior pressure, into the boiler or receiver from which it was first taken.

Many of the elements of this invention are not new, and we do not desire to claim them separately nor broadly; but the combination and arrangement of them we hold to be new, as we are not aware of their being combined and arranged in the same manner and producing the economic results that this does.

In the drawings, Figure 1 represents-an end elevation of our apparatus .with some of the parts shown in side elevation Fig. 2 is a side elevation of the same with the high-pressure boiler and superheater shown in dotted lines.

A is the low'pressure boiler, which may be supplied with water by any ordinary means; 0, the high-pressure boiler, in front of which is placed a superheater, B. D is the pump, and E the working-engine. F is the pipe and cook, admitting steam from the high-pressure boiler to the superheater. G is the throttle-valve; H,the1ive-steam pipe, and I the exhaust-pipe. J is an injector, and K the superheated-steam pipe, which supplies the injector. Lis the pipe connectin gthe pump to thelow-pressure boiler, through which the water from the low-pressure boiler is pumped into the high-pressure boiler through pipe M. N is the steam-supply pipe to the pump, or it may be supplied from the (No model.)

high-pressure boiler through pipe 0. All these pipes are provided with stop-cocks for regulating the liquids or gases passing through them.

Operation: Steam being generated in the high'pressure boiler to the working-point, com munication is established with the low-pressure boiler, some fire being also started under the said low-pressure boiler. When the pressure of engine of the pump passes into the main exhaust-pipe. The pump may be worked from either boiler.

By the above construction it will be observed that no condensation of the steam takes place, and consequently no waste of heat, and therefore economy of fuel.

Having described our invention, what we claim as new, and desire to secure by Letters Patent, is

In an apparatus for utilizing exhaust-steam, the combination of the hi gh-pressure boiler, the low-pressure boiler, and the superheater with a pump, the said pump being adapted to pump water from the saidlow-pressure boilerinto the high-pressure one, and an injector for forcing the exhaust-steam into the low-pressure boiler by means ofsuperheated steam, the whole being adapted to keep up a constant circulation, by which the exhaust is utilized without condensation, in the manner shown and described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

HARVEY T. LITGHFIELD. DAVID RENSHAW.

Witnesses:

J 0s. H. ADAMS, B. OHARA. 

